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CVE-2026-0871: Org.keycloak/keycloak-services: keycloak: unauthorized modification of unmanaged user attributes by administrators
ROUTINE
Telemetry drift only. No threshold crossed and no authority ruling changed.
CVE record, CISA KEV and EPSS as of 2026-10-18.
CVEs like this one computed, by meaning
What to do now held facts and links
- Upgrade to the fixed version for your release line, or later: keycloak 26.4.0; build of keycloak 26.4.9 upper bounds of the CVE record's affected ranges
- Later advisories still cover the fixes above and name higher ones: keycloak 26.7.2 (CVE-2026-14613), 26.4.14 (CVE-2026-14614), 26.4.14 (CVE-2026-14615), 26.7.2 (CVE-2026-15571), 26.4.14 (CVE-2026-15572), 26.4.14 (CVE-2026-15573), 26.7.2 (CVE-2026-15945), 26.4.14 (CVE-2026-16071), 26.7.3 (CVE-2026-16072), 26.7.3 (CVE-2026-16089), 26.7.3 (CVE-2026-16093), 26.4.14 (CVE-2026-16102), 26.7.3 (CVE-2026-16104), 26.7.3 (CVE-2026-16105), 26.7.3 (CVE-2026-16106), 26.7.3 (CVE-2026-16108), 26.4.14 (CVE-2026-16442), 26.4.14 (CVE-2026-16443), 26.7.2 (CVE-2026-17048), 26.7.3 (CVE-2026-17059), 26.7.3 (CVE-2026-18201), 26.7.3 (CVE-2026-18209), 26.7.3 (CVE-2026-18214), 26.7.3 (CVE-2026-18215), 26.7.3 (CVE-2026-18218), 26.7.3 (CVE-2026-18570), 26.7.3 (CVE-2026-18571), 26.7.3 (CVE-2026-18572), 26.7.3 (CVE-2026-18573), 26.7.2 (CVE-2026-18963), 26.4.10 (CVE-2026-2092), 26.4.11 (CVE-2026-2366), 26.4.10 (CVE-2026-2575), 26.4.10 (CVE-2026-2603), 26.4.11 (CVE-2026-3429), 26.4.12 (CVE-2026-37978), 26.4.12 (CVE-2026-37979), 26.4.12 (CVE-2026-37981), 26.4.12 (CVE-2026-37982), 26.4.12 (CVE-2026-4630), 26.4.12 (CVE-2026-7307), 26.4.12 (CVE-2026-7504), 26.4.12 (CVE-2026-7507), 26.4.12 (CVE-2026-7571), 26.4.13 (CVE-2026-9083), 26.4.13 (CVE-2026-9086), 26.4.13 (CVE-2026-9099), 26.4.13 (CVE-2026-9705), 26.4.13 (CVE-2026-9799), 26.4.13 (CVE-2026-9800) OSV advisories
- Record your decision, dated and frozen with today's evidence: patch by a date · mitigated by a compensating control · deferred · accepted the risk · not affected
- Check your version against the ranges this record publishes.
What it is stated by the CNA
A flaw was found in Keycloak. An administrator with `manage-users` permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.
- weakness
- CWE-266 Incorrect Privilege Assignment
- affected
- Red Hat build of Keycloak 26.4; Red Hat build of Keycloak 26.4.9; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7
- published ranges
- redhat build of keycloak < 26.4.9; redhat keycloak < 26.4.0
- first unaffected version, by branch
- keycloak 26.4.0; build of keycloak 26.4.9
- fixed by package (from OSV advisories)
- keycloak (Bitnami): 26.4.9 BIT-keycloak-2026-0871org.keycloak:keycloak-server-spi-private (Maven): 26.5.2 GHSA-v4jw-m6rm-399h
- later fixes (from OSV advisories)
- keycloak 26.4.9 is inside a range CVE-2026-14613 (BIT-keycloak-2026-14613) lists as affected. That advisory is fixed in 26.7.2.keycloak 26.4.9 is inside a range CVE-2026-14614 (BIT-keycloak-2026-14614) lists as affected. That advisory is fixed in 26.4.14.keycloak 26.4.9 is inside a range CVE-2026-14615 (BIT-keycloak-2026-14615) lists as affected. That advisory is fixed in 26.4.14.keycloak 26.4.9 is inside a range CVE-2026-15571 (BIT-keycloak-2026-15571) lists as affected. That advisory is fixed in 26.7.2.keycloak 26.4.9 is inside a range CVE-2026-15572 (BIT-keycloak-2026-15572) lists as affected. That advisory is fixed in 26.4.14.keycloak 26.4.9 is inside a range CVE-2026-15573 (BIT-keycloak-2026-15573) lists as affected. That advisory is fixed in 26.4.14.
- severity
- 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
- assigned by
- redhat
- published
- 2026-02-27
check us access.redhat.com access.redhat.com access.redhat.com bugzilla.redhat.com
Exploit code held, dated
- exploit code
- None held in the PoC-in-GitHub feed. A public repository changes this brief.
What moved held, dated
| date | EPSS | event |
|---|---|---|
| 27 Feb 2026 | 0.00024 | |
| 5 Mar 2026 | 0.00032 | |
| 31 Mar 2026 | 0.00034 | |
| 21 Apr 2026 | 0.00011 | |
| 6 May 2026 | 0.00012 | |
| 15 Jun 2026 | 0.00307 | scoring model v2026.06.15 |
| 28 Sep 2026 | 0.00319 | |
| 16 Oct 2026 | 0.00326 |
8 observations held. A step marked with a scoring model moved because the measurement was replaced, not because the vulnerability changed.
Outside the record researched, cited
This section reads the record's references and adds cited findings from outside it. It needs an account. Everything above is held facts and is complete without it.
What would change this brief held, dated
- CISA KEV
- Not listed in the catalogue we hold. A listing changes this brief.
- exploit probability
- 0.00 on 2026-10-16 (FIRST's EPSS, a probability and not evidence of exploitation). Next band line: 10% (0.10). Crossing a line changes this brief.
- fix
- Held: keycloak 26.4.0; build of keycloak 26.4.9. A newer fix from the CNA or OSV changes this brief.
How to check this
Every value above is held with two dates: when it was true upstream (as_of) and when we recorded it (tx_from). Re-derive the exploit probability as it stood on any date:
SELECT value, source, source_version, as_of, tx_from
FROM volatile_valid_as_of('CVE-2026-0871', '2026-10-31T23:59:59.999999Z', now());